Cannot Build gem for Ruby on Rails -


**cannot build ruby gem reason. new ruby not sure happening **

this output

kevins-macbook-air-2:grades kev$ bundle exec rake release

rake aborted! /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:in block in quick_emit': stack level deep (systemstackerror) /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2286:inblock (2 levels) in to_yaml' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/coder.rb:36:in map' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2285:inblock in to_yaml' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:in call' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:inblock in quick_emit' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2286:in block (2 levels) in to_yaml' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/coder.rb:36:inmap' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2285:in block in to_yaml' ... 9618 levels... /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/command_manager.rb:170:inprocess_args' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/command_manager.rb:130:in run' /users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/gem_runner.rb:60:inrun' /users/kev/.rvm/rubies/ruby-2.2.0/bin/gem:21:in <main>' /users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:155:insh' /users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:70:in build_gem' /users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:39:inblock in install' /users/kev/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in eval' /users/kev/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in' tasks: top => release => build (see full trace running task --trace)

had same problem attempting build gem. turns out using out of date version of rubygems (2.2.5) ruby 2.2.3. upgrading rubygems solved me. rvm has command this:

$ rvm rubygems latest


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